Objective lens, optical pickup apparatus and optical...

Details Objective lens, optical pickup apparatus and optical... Objective lens, optical pickup apparatus and optical...

2006-02-07

2010-02-09

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S112080

Reexamination Certificate

active

07660225

ABSTRACT:
An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction when a wavelength of an incident light flux becomes longer, and a second optical path difference providing structure changing spherical aberration in over-corrected direction when a wavelength of an incident light flux becomes longer are superimposed.

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patent: 2002/0135891 (2002-09-01), Kimura et al.
patent: 2003/0053223 (2003-03-01), Takeuchi et al.
patent: 2004/0037204 (2004-02-01), Takeuchi
patent: 1 276 104 (2003-01-01), None
patent: 1 528 546 (2005-05-01), None
patent: 2004-079146 (2004-03-01), None
European Search Report dated Nov. 6, 2008.

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